CN101873940B - Pneumatic radial tire - Google Patents
Pneumatic radial tire Download PDFInfo
- Publication number
- CN101873940B CN101873940B CN2008801176210A CN200880117621A CN101873940B CN 101873940 B CN101873940 B CN 101873940B CN 2008801176210 A CN2008801176210 A CN 2008801176210A CN 200880117621 A CN200880117621 A CN 200880117621A CN 101873940 B CN101873940 B CN 101873940B
- Authority
- CN
- China
- Prior art keywords
- bracing ply
- steel cord
- tire
- equal
- cord
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 79
- 239000010959 steel Substances 0.000 claims abstract description 79
- 239000011324 bead Substances 0.000 claims abstract description 4
- 230000001419 dependent effect Effects 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 5
- 238000007493 shaping process Methods 0.000 abstract 1
- 206010016256 fatigue Diseases 0.000 description 14
- 238000012360 testing method Methods 0.000 description 11
- 238000009792 diffusion process Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000005728 strengthening Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000032798 delamination Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 210000003754 fetus Anatomy 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 230000003252 repetitive effect Effects 0.000 description 2
- 206010016275 Fear Diseases 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
- D07B1/0606—Reinforcing cords for rubber or plastic articles
- D07B1/0646—Reinforcing cords for rubber or plastic articles comprising longitudinally preformed wires
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/0007—Reinforcements made of metallic elements, e.g. cords, yarns, filaments or fibres made from metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
- D07B1/0606—Reinforcing cords for rubber or plastic articles
- D07B1/062—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration
- D07B1/0633—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration having a multiple-layer configuration
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2001—Wires or filaments
- D07B2201/2006—Wires or filaments characterised by a value or range of the dimension given
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2001—Wires or filaments
- D07B2201/2007—Wires or filaments characterised by their longitudinal shape
- D07B2201/2008—Wires or filaments characterised by their longitudinal shape wavy or undulated
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2021—Strands characterised by their longitudinal shape
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2024—Strands twisted
- D07B2201/2029—Open winding
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2401/00—Aspects related to the problem to be solved or advantage
- D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
- D07B2401/2005—Elongation or elasticity
- D07B2401/201—Elongation or elasticity regarding structural elongation
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2401/00—Aspects related to the problem to be solved or advantage
- D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
- D07B2401/208—Enabling filler penetration
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2501/00—Application field
- D07B2501/20—Application field related to ropes or cables
- D07B2501/2046—Tire cords
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
- Ropes Or Cables (AREA)
Abstract
This aims to provide a pneumatic radial tire using corrugating steel cords in a circumferential belt. The pneumatic radial tire can improve the durability of the corrugating steel cords, thereby to prevent the fatigue rupture of the steel cords, as might otherwise be caused by the increase of an input. The pneumatic radial tire has a skeleton of a carcass (1) extending in a toroidal shape between a pair of right and left bead portions, and a belt layer (2) and a tread layer (5) are sequentially laminated on the radially outer tire side of the carcass (1). The belt layer (2) includes at least one layer of circumferential belt (3) composed of a plurality of corrugated-shape or zigzag-shape steel cords extending along the tire circumference direction. The radius of curvature (R) of shaping of the steel cords, as extracted from the circumferential belt, is within a range of 18 mm to 125 mm.
Description
Technical field
The present invention relates to Pneumatic belt tire (following also only be called " tire "), specifically, relate to the Pneumatic belt tire with the circumferencial direction bracing ply that is consisted of by the many waveforms of extending along tire circumferential direction or zigzag die mould steel cord.
Background technology
All the time, as the bracing ply of air-inflation meridian tire, adopt and along tire circumferential direction the circumferencial direction bracing ply is set, well-known is that described circumferencial direction bracing ply can be used waveform or zigzag die mould cord.
For example, following content is disclosed in patent documentation 1: the radial tire for heavy load that uses in the contour interior pressure situation of truck, city motor bus and cross-country car, particularly in the flat tire, use with waveform or zigzag many cords that extend along the tire equator face or monofilament as reinforcing element, and use the multilayer bracing ply that forms behind the described reinforcing element of rubber coated to replace the bracing ply that is formed by the cord that is obliquely installed, perhaps described multilayer bracing ply is appended to described bracing ply and uses.
And disclose following content in patent documentation 2: the fetus face around the body piles is the bracing ply of 2 layers of oblique and the crown strengthening layer of arranging cord along tire circumferential direction, it is banded that this crown strengthening layer is, be positioned at bracing ply lower floor, reinforcing element by many cords (perhaps monofilament) of at least 1 layer of waveform (perhaps serration) consists of, thereby can effectively prevent delamination in the tire weight situation not increasing.
But simultaneously, because the cords in the banded crown strengthening layer of arranging along tire circumferential direction etc. are usually in the circumferencial direction spirally winding, when outer damage etc. arrives along near the crown strengthening layer of tire circumferential direction the time, might enter from the outside by moisture, described moisture spreads along the circumferential length direction easily.Therefore, need to guarantee filament-to-filament interval between the outer mantle fiber greater than required interval, and infiltrate rubber in that steel cord is inner, thereby prevent the diffusion of moisture.
As making rubber infiltrate the technology of steel cord inside, disclose the large-scale radial-ply tyre of a kind of inflation in patent documentation 3, it is steel cord about 23mm that this tire is used the die mould radius of curvature R make the steel cord that is embedded under the tire belt layer state at bracing ply.
Patent document 1: Japanese kokai publication hei 11-245617 communique
Patent documentation 2: No. 2623003 communique of Japan's special permission
Patent documentation 3: No. 3444925 communique of Japan's special permission
But, in being processed as waveform or zigzag steel cord, because the local radius of curvature R of its die mould part diminishes, have the easy problem of concentrating that occurs by the stressed caused buckling strain of tire circumferential direction of this part.This becomes the major cause that the steel cord endurance quality reduces.
And, in the tire with the circumferencial direction bracing ply that is consisted of by waveform or zigzag die mould steel cord, from its structure, can give the circumferencial direction bracing ply very large burden.Because the strain when the circumferencial direction bracing ply directly bears tyre rotation will be born strain deformation repeatedly when tyre rotation.Therefore, increase together with the burden that tire size will maximize and flattening causes from now on, the durabilitys such as delamination that fears are entertained that can occur to be caused by stressed increase reduce phenomenon, so the task of top priority is the durability of attempting to improve the circumferencial direction bracing ply.
And in order to improve the durability of circumferencial direction bracing ply, people also expect further to improve the corrosion stability of strengthening cord.
Summary of the invention
The purpose of this invention is to provide a kind of technology, for the Pneumatic belt tire that in the circumferencial direction bracing ply, uses waveform or zigzag die mould steel cord, by improving the durability of described circumferencial direction bracing ply, the steel cord fracture by fatigue that may occur in the time of can preventing particularly from now on stressed increase.
And other purpose of the present invention provides a kind of and can further improve the Pneumatic belt tire that bracing ply is strengthened the decay resistance of cord for when reaching above-mentioned purpose.
Inventor of the present invention is in order to solve above-mentioned problem through attentively finding after the research, the radius of curvature R of the die mould section by setting larger waveform or zigzag die mould steel cord, can disperse the concentrating of buckling strain of this part, improve the durability of cord, and then finish the present invention.
Namely, the present invention is to provide Pneumatic belt tire, it is take the body piles that extends across the ring-type between the pair of right and left bead part as skeleton, by in the tire radius direction of this body piles outside stacked above one another bracing ply being set and tread ply forms, this Pneumatic belt tire is characterised in that, described bracing ply comprises at least 1 layer of circumferencial direction bracing ply that is made of the many waveforms of extending along tire circumferential direction or zigzag die mould steel cord, and, take out the radius of curvature R of die mould of the steel cord after lower taking-up of steel cord situation of this circumferencial direction bracing ply in more than or equal to 18mm and the scope less than or equal to 125mm.
In the present invention, the steel cord of described circumferencial direction bracing ply is served as reasons and is had more than or equal to 0.12mm and the twisting cord that consists of less than or equal to the monofilament of the filament diameter of 0.45mm, preferred its has more than or equal to 1.20mm and less than or equal to the cord diameter of 3.00mm, and, have more than or equal to 0.3% and less than or equal to the incipient extension dependent variable in 3.0% scope.And preferred described bracing ply comprises 1 layer to 4 layers described circumferencial direction bracing ply, and also preferred described bracing ply comprises 1 layer to 3 layers oblique bracing ply that is made of the cord that extends along the direction that tilts with respect to tire circumferential direction.
And, in the present invention, described steel cord is to form after the layer that is twisted 2 layers or 3 layers by many steel wire monofilament is twisted with the fingers steel cord die mould waviness or serration, and the ratios delta L/df of the filament-to-filament interval delta L between the outer at least mantle fiber and overcoat filament diameter df is preferably 0.08～1.00.
According to the present invention, by said structure, realized improving the waveform die mould steel cord of circumferencial direction bracing ply durability, and effectively prevent the Pneumatic belt tire of steel cord fracture by fatigue.And simultaneously, realized improving decay resistance Pneumatic belt tire.
Description of drawings
Fig. 1 is near the amplification profile of tyre surface of the Pneumatic belt tire in example of the present invention.
Fig. 2 is the scheme drawing that is processed into corrugated steel cord.
Fig. 3 is the chart that the strain-load curve of steel cord is shown.
Fig. 4 is the instruction diagram of overcoat filament diameter df and filament-to-filament interval delta L.
Description of reference numerals
1, body piles
2, bracing ply
3, circumferencial direction bracing ply
4, oblique bracing ply
5, tread ply
10, Pneumatic belt tire
20, steel wire monofilament
The radius of curvature of the die mould of R, steel cord
Df, overcoat filament diameter
Δ L, filament-to-filament interval
A, amplitude
λ, wavelength
The specific embodiment
Next, with reference to accompanying drawing, preferred implementation of the present invention is elaborated.
In Fig. 1, amplify near the section-drawing of fetus face of the Pneumatic belt tire in the expression example of the present invention.Graphic Pneumatic belt tire of the present invention 10 is for take the body piles 1 that extends across the ring-type between the pair of right and left bead part (not shown) as skeleton, bracing ply 2 is set and tread ply 5 forms in the tire radius direction outside of described body piles stacked above one another.
In the present invention, bracing ply 2 comprises at least 1 layer of circumferencial direction bracing ply 3 that is made of the many waveforms of extending along tire circumferential direction or zigzag die mould steel cord, comprise 2 layers of circumferencial direction bracing ply 3 in the illustrated embodiment, the steel cord that circumferencial direction bracing ply 3 under not changing the shape situation from tire takes out, the radius of curvature R of its die mould is in more than or equal to 18mm and the scope less than or equal to 125mm, preferably in more than or equal to 20mm and the scope less than or equal to 75mm.
As mentioned above, in waveform or zigzag die mould steel cord, produce concentrating of buckling strain in die mould section, because the stressed increase that from now on size maximization etc. cause, fracture by fatigue that may be take described die mould section as initial point generation steel cord.In order to prevent that described fracture by fatigue from occuring, effective method is the radius of curvature R of the described die mould of increase section, thereby relaxes concentrating of buckling strain.In the present invention, be set in the above-mentioned scope by the radius of curvature R with described die mould section, effectively relaxed concentrating of buckling strain, can prevent the generation of fracture by fatigue.
At this, as shown in Figure 2, the radius of curvature R of the die mould section of definition among the present invention is, the radius of curvature that the die mould section of waveform or zigzag steel cord 20 (amplitude a, wavelength X) of will being processed into is measured to as approximate circular arc.Specifically, desirable radius of curvature R is the function of amplitude a and wavelength X: R=1/a (λ/2 π)
2In the situation of described radius of curvature R less than 18mm, can not fully relax buckling strain, correspondingly produce easily concentrating of strain in die mould section, cause the cord fatigue resistance to reduce.On the other hand, described radius of curvature R surpasses in the situation of 125mm, owing to can not guarantee required steel wire amount in the tire, at other aspect of performances, for example is difficult for guaranteeing initial strain required when tire is made, and also may produce the phenomenon such as bad of buckling.
And the wavelength X that is processed as waveform or zigzag steel cord of taking out from tire is 20mm～120mm, and the ratio of preferred amplitude a and λ satisfies the following formula relation: 0.025≤a/ λ≤0.065.
And, the above-mentioned steel cord that consists of circumferencial direction bracing ply 3 for by filament diameter more than or equal to 0.12mm and less than or equal to 0.45mm, be preferably greater than the twisting cord that equals 0.15mm and consist of less than or equal to the monofilament in the scope of 0.36mm, cord diameter is more than or equal to 1.20mm and less than or equal to 3.00mm, particularly preferably in more than or equal in 1.20mm and the scope less than or equal to 2.00mm, and, the incipient extension dependent variable is more than or equal to 0.3% and less than or equal to 3.0%, particularly preferably in more than or equal to 0.9% and less than or equal in 2.0% scope.By using this kind steel cord, can guarantee more well the durability of cord.
The incipient extension dependent variable of above-mentioned steel cord is less than in 0.3% situation, and cord can be broken during during interior pressure and increase tire footpath, can not become normal shape when tire is buckled, and will cause the irregular wear deterioration.On the other hand, the incipient extension dependent variable of cord surpasses in 3.0% situation, and directly the increase meeting is excessive by tire that interior pressure causes, can make thus the tread-rubber of surface of tyre be in extended state, causes resistance to abrasion and shear resistant to reduce.At this, as shown in Figure 3, the incipient extension dependent variable of steel cord defines in the strain-load curve of cord.
Especially, steel cord as above-mentioned circumferencial direction bracing ply 3, preferably use above-mentioned radius of curvature R being the steel more than the 2500MPa more than or equal to 20mm and less than or equal to the intensity in the 30mm scope, perhaps use above-mentioned radius of curvature R being the steel more than the 2900MPa more than or equal to 30mm and less than or equal to the intensity in the 75mm scope.The intensity of the steel that use is not preferably used owing to the undercapacity of steel cord required in the tire in this situation below scope.
And, as suitable steel cord of the present invention, can exemplify out the layer that is twisted 2 layers or 3 layers by many steel wire monofilament is twisted with the fingers steel cord die mould waviness or the formed steel cord of serration.In described steel cord, the filament-to-filament interval delta L between the preferred outer at least mantle fiber and the ratios delta L/df of overcoat filament diameter df are 0.08～1.00, are more preferably in 0.20～0.70 the scope.
Fig. 4 illustrates filament-to-filament interval delta L between the outer mantle fiber and the instruction diagram of filament diameter df.Be 0.08～1.00 by the value that makes Δ L/df, rubber fully infiltrates steel cord inside, so that be filled with rubber in the cord.Its result is, even for example moisture enters from the outside, can prevent that also moisture from spreading at length direction.On the contrary, the value of Δ L/df surpasses in 1.00 situations, equalization of strain at each monofilament when stressed of repeatedly stretching can be destroyed, produce the problem of the durability reduction of steel cord, on the other hand, the value of Δ L/df is lower than in 0.08 situation, and it is inner that rubber is difficult for infiltrating steel cord, so that the effect of the decay resistance of bracing ply reinforcement cord is insufficient.
And in the present invention, the value of preferred df is in 0.15～0.36 scope.The value of df is lower than in the 0.15mm situation, guarantees the durability difficult of steel cord, and on the other hand, the value of df surpasses in 0.36 situation, and rubber infiltrates the inside difficult of steel cord, thereby can not obtain well effect of the present invention.
Filament-to-filament interval delta L can adjust by the monofilament radical that for example reduces outer race section (sheath) or the monofilament radical that increases core.In addition, can also attenuate by the filament diameter that only makes outer race section, only make the filament diameter chap of core, make the pitch smaller of twisting thread of monofilament, the combination of method or these methods such as diminish of the tension force when perhaps making die mould is adjusted.
In the present invention, bracing ply 2 comprises at least 1 layer of above-mentioned circumferencial direction bracing ply 3, preferably includes 1 layer to 4 layers above-mentioned circumferencial direction bracing ply 3.Comprise that bracing ply 2 integral thickness are blocked up in circumferencial direction bracing ply 3 situations more than 5 layers or 5 layers, cause weight increase and anti-heat generation deteriorated, preferred circumferencial direction bracing ply is 1～4 layer.And circumferencial direction bracing ply 3 can also consist of by steel cord is along the circumferential direction arranged the band that forms as a whole.
And preferred bracing ply 2 also comprises 1 layer to 3 layers by the oblique bracing ply 4 that consists of along the cord that tilts to extend with respect to tire circumferential direction except above-mentioned circumferencial direction bracing ply 3.In illustrative example, be provided with 2 layers of to each other oblique bracing ply 4 of mutual oblique.Do not arrange in oblique bracing ply 4 situations, distortion, the deteriorated situation of generation irregular wear that can not suppress tire width direction are arranged.On the other hand, arrange in oblique bracing ply 4 situations more than 4 layers or 4 layers, integral thickness is blocked up, might cause weight increase and anti-febrifacient deteriorated.
And, in tire 10 of the present invention, on the surface of the tread ply 5 of the tire radius direction arranged outside of the crown part of body piles 1, be formed with suitable tread contour, be provided with the inside liner (not shown) at the innermost layer of tire.And, in tire of the present invention, as the gas of filling in the tire, can use the common air that for example changes oxygen partial pressure, perhaps use the unreactable gass such as nitrogen.
Below, by embodiment the present invention is described in more detail.
(embodiment 1～5, comparative example 1～5)
(3 layers of twisting: in the waveform die mould condition situation 3+9+15 structure), making the tyre model with structure shown in Figure 1 is the Pneumatic belt tire of 495/45R22.5 to change respectively the steel cord that is applied to the circumferencial direction bracing ply shown in following table 1,2.
In each tire for test, bracing ply 2 is the structure of the oblique bracing ply 4 that comprises that cord that direction that 2 layers of circumferencial direction bracing ply 3 that is made of many waveform steel cords that extend along tire circumferential direction and 2 layers of edge tilt with respect to tire circumferential direction is extended consists of.
(fatigue characteristic evaluation)
Carry out following in-house test: make each be under 120% the loading condition of normal air pressure, normal load 7.0 ten thousand km that advance with 60km/h for test tire, after the test, estimate each for the fatigue characteristic of the steel cord in the test tire by carrying out X-ray examination.In X-ray examination, definition is ◎ without the situation of cords break, although find a little cords break in actual applications the situation of no problem be zero, the situation that cords break arranged for *.Its result is incorporated in expression in the following table 1,2.
(table 1)
(table 2)
Shown in above-mentioned table 1,2, be applied to confirm to improve the durability of steel cord in the Pneumatic belt tire of embodiment of circumferencial direction bracing ply at the waveform die mould steel cord that will satisfy correlated condition of the present invention.
Below, by embodiment the present invention is described in more detail.
(embodiment 6～10 and comparative example 6～11)
The steel cord that will have cord structure, filament diameter shown in the following table 3,4 is processed into die mould radius of curvature and the Δ L/df of regulation, thereby makes each steel cord.
Next, and embodiment 1 in the same manner, tire (the tyre model 495/45R22.5 that each steel cord that obtains is applied to have structure shown in Figure 1, whole numbers of plies: 4 layers, the oblique bracing ply: 2 layers, and the bracing ply enhancement Layer: 2 layers), make respectively each for the tire of test.Subsequently, use the tire that obtains, its rubber osmosis rate, the rate of water diffusion and cord fatigability are estimated.The result is integrated with in following table 3 and the table 4.In addition, rubber osmosis rate, the rate of water diffusion and fatigability are defined as follows described.
(rubber osmosis rate)
From use each tire for the steel cord manufacturing of test, take out steel cord, whole outer monofilament of dismantling, take out core after, the length of the core silk that is covered by rubber from 4 direction detections calculates the result by following formula (1).Rubber osmosis rate (%)=rubber overlay length (mm)/specimen length (mm) * 100 (1)
(rate of water diffusion)
From use each tire for the steel cord manufacturing of testing, take out steel cord, initial load=intensity * 0.2, repetitive load=intensity * 0.05 under the condition of ambient humidity 90%, is measured it and is being applied the rate of water diffusion after the repetitive strain 1,000 ten thousand times.The rate of water diffusion need to find the longest evidence of corrosion, calculates the result according to following formula (2).
The rate of water diffusion (%)=maximum corrosion length (mm)/chuck (chuck) gap length (mm) * 100 (2)
(cord fatigability)
Carry out following real train test: make to use for each tire of the steel cord manufacturing of test and advance being under 120% the loading condiction of normal air pressure, normal load.After the test, estimate by carrying out X-ray examination.For the steel cord of belt ends, the definition fatigability well is zero, badly be *.
(continuous nextpage)
(table 3)
(table 4)
By upper table 3,4, can find out for tire of the present invention, increased the rubber osmosis rate, improved the rate of water diffusion, improved corrosion stability.And, will improve the fatigue resistance of the cord in the tire after the described advantage merging.Although the cord fatigue resistance result of comparative example 10 and 11 is " zero ", it is that embodiment 7～8 below the 125mm compares or has some inferior positions with the cord radius of curvature.
Claims (4)
1. Pneumatic belt tire, described Pneumatic belt tire is take the body piles that extends across the ring-type between the pair of right and left bead part as skeleton, by in the tire radius direction of this body piles outside stacked above one another bracing ply being set and tread ply forms, it is characterized in that, described bracing ply comprises at least 1 layer of circumferencial direction bracing ply that is made of the many waveforms of extending along tire circumferential direction or zigzag die mould steel cord, and, take out in the steel cord situation of this circumferencial direction bracing ply, the radius of curvature R of the die mould of the steel cord after the taking-up is in more than or equal to 18mm and the scope less than or equal to 125mm, wherein, described radius of curvature R is, the radius of curvature that the die mould section of being processed into waveform or zigzag described steel cord is measured to as approximate circular arc
The steel cord of described circumferencial direction bracing ply is more than or equal to 0.12mm and the twisting cord that consists of less than or equal to the monofilament of 0.45mm by filament diameter, this steel cord has more than or equal to 1.20mm and less than or equal to the cord diameter of 3.00mm, and it has more than or equal to 0.3% and less than or equal to the incipient extension dependent variable in 3.0% scope.
2. Pneumatic belt tire according to claim 1 is characterized in that, described bracing ply comprises 1 layer to 4 layers described circumferencial direction bracing ply.
3. Pneumatic belt tire according to claim 1 is characterized in that, described bracing ply comprises 1 layer to 3 layers oblique bracing ply that is made of the cord that extends along the direction that tilts with respect to tire circumferential direction.
4. Pneumatic belt tire according to claim 1, it is characterized in that, the layer that is twisted 2 layers or 3 layers by many steel wire monofilament is twisted with the fingers steel cord die mould waviness to described steel cord or serration forms, and the filament-to-filament interval △ L between the outer at least mantle fiber and the ratio △ L/df of overcoat filament diameter df are 0.08～1.00.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007-305437 | 2007-11-27 | ||
| JP2007305437A JP5164538B2 (en) | 2007-11-27 | 2007-11-27 | Pneumatic radial tire |
| JP2008-147651 | 2008-06-05 | ||
| JP2008147651A JP5455180B2 (en) | 2008-06-05 | 2008-06-05 | Pneumatic radial tire |
| PCT/JP2008/071541 WO2009069697A1 (en) | 2007-11-27 | 2008-11-27 | Pneumatic radial tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101873940A CN101873940A (en) | 2010-10-27 |
| CN101873940B true CN101873940B (en) | 2013-02-13 |
Family
ID=40678589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008801176210A Expired - Fee Related CN101873940B (en) | 2007-11-27 | 2008-11-27 | Pneumatic radial tire |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20100300596A1 (en) |
| EP (1) | EP2218589B1 (en) |
| CN (1) | CN101873940B (en) |
| ES (1) | ES2393526T3 (en) |
| PL (1) | PL2218589T3 (en) |
| WO (1) | WO2009069697A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102431395A (en) * | 2011-11-11 | 2012-05-02 | 姚珍汉 | Setting method of all-steel radial inflation-free tire |
| FR3032978B1 (en) * | 2015-02-19 | 2017-10-27 | Michelin & Cie | MULTITORON 1XN STRUCTURE CABLE FOR PNEUMATIC PROTECTION FRAME |
| US20220063352A1 (en) * | 2020-08-31 | 2022-03-03 | The Goodyear Tire & Rubber Company | Truck tire |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0425318B1 (en) * | 1989-10-27 | 1994-07-13 | Bridgestone Corporation | Pneumatic radial tires |
| CN1743188A (en) * | 2004-08-30 | 2006-03-08 | 住友橡胶工业株式会社 | Pneumatic tire with metal cord and method of manufacturing metal cord |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2623003B2 (en) | 1989-03-14 | 1997-06-25 | 株式会社ブリヂストン | Pneumatic radial tire |
| JP3016622B2 (en) * | 1991-04-27 | 2000-03-06 | 株式会社ブリヂストン | Pneumatic radial tire |
| JP3444925B2 (en) | 1993-07-05 | 2003-09-08 | 株式会社ブリヂストン | Large pneumatic radial tire |
| ES2192679T3 (en) * | 1996-04-18 | 2003-10-16 | Bridgestone Corp | STEEL THREADS FOR THE REINFORCEMENT OF RUBBER ITEMS AND PNEUMATIC COVERS. |
| JPH11245617A (en) | 1998-03-04 | 1999-09-14 | Bridgestone Corp | Pneumatic tire |
| JP4688355B2 (en) * | 2001-03-07 | 2011-05-25 | 金井 宏彰 | Steel cord for tire reinforcement and tire |
| EP1477333B1 (en) * | 2002-01-24 | 2018-06-20 | Bridgestone Corporation | Pneumatic radial tire |
| JP4630153B2 (en) * | 2005-08-02 | 2011-02-09 | 住友ゴム工業株式会社 | Manufacturing method of metal cord for tire and manufacturing method of pneumatic tire using the same |
| JP4903035B2 (en) * | 2006-12-27 | 2012-03-21 | 株式会社ブリヂストン | Radial tire |
| JP4888145B2 (en) * | 2007-02-08 | 2012-02-29 | 横浜ゴム株式会社 | Pneumatic radial tire |
-
2008
- 2008-11-27 WO PCT/JP2008/071541 patent/WO2009069697A1/en active Application Filing
- 2008-11-27 US US12/744,746 patent/US20100300596A1/en not_active Abandoned
- 2008-11-27 EP EP08853314A patent/EP2218589B1/en not_active Not-in-force
- 2008-11-27 CN CN2008801176210A patent/CN101873940B/en not_active Expired - Fee Related
- 2008-11-27 PL PL08853314T patent/PL2218589T3/en unknown
- 2008-11-27 ES ES08853314T patent/ES2393526T3/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0425318B1 (en) * | 1989-10-27 | 1994-07-13 | Bridgestone Corporation | Pneumatic radial tires |
| CN1743188A (en) * | 2004-08-30 | 2006-03-08 | 住友橡胶工业株式会社 | Pneumatic tire with metal cord and method of manufacturing metal cord |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2002-339278A 2002.11.27 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2218589B1 (en) | 2012-08-29 |
| CN101873940A (en) | 2010-10-27 |
| EP2218589A4 (en) | 2011-01-05 |
| US20100300596A1 (en) | 2010-12-02 |
| EP2218589A1 (en) | 2010-08-18 |
| PL2218589T3 (en) | 2013-01-31 |
| ES2393526T3 (en) | 2012-12-26 |
| WO2009069697A1 (en) | 2009-06-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7562684B2 (en) | Motorcycle radial tire with specified steel belt cord | |
| EP2639082B1 (en) | Pneumatic tire | |
| US20080011401A1 (en) | Steel cord having ultrafine steel filaments to reinforce tire carcass and radial tire for passenger car using same | |
| EP2653608B1 (en) | Steel cord for reinforcing rubber article, and pneumatic tire using same | |
| CN102762390A (en) | Pneumatic tire | |
| EP2246201B1 (en) | Pneumatic radial tire | |
| US6102095A (en) | Corrosion resistant steel cords and pneumatic tires reinforced with same | |
| CN101873940B (en) | Pneumatic radial tire | |
| JP2002144814A (en) | Pneumatic radial tire | |
| JP4633517B2 (en) | Steel cord and tire | |
| JP2010264947A (en) | Pneumatic radial tire | |
| EP2178708B1 (en) | Pair of pneumatic tyres for two -wheeled vehicles | |
| JP4903035B2 (en) | Radial tire | |
| JP5837399B2 (en) | Pneumatic radial tire for trucks and buses | |
| US5871603A (en) | Pneumatic tires with organic or inorganic fiber cord bead core | |
| JP5013522B2 (en) | Pneumatic radial tire | |
| WO2023248819A1 (en) | Tire | |
| WO2024038639A1 (en) | Tire | |
| JPH11310016A (en) | Assembly of safety tire and rim | |
| JP5164538B2 (en) | Pneumatic radial tire | |
| JP2010269675A (en) | Pneumatic tire | |
| JP2004050912A (en) | Pneumatic radial tire for heavy load | |
| JP2005041392A (en) | Tire excellent in bead section durability | |
| JPH10109508A (en) | Pneumatic tyre | |
| JP2010115981A (en) | Pneumatic radial tire |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130213 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |